Abstract
Poly(vinylidene fluoride) (PVDF) and (Ba0.5Sr0.4Ca0.1)TiO3 (BSCT) are used as matrix and fillers, respectively, to prepare polymer functional composites by solution casting with N,N-dimethyl formamide as a solvent. It is found that the addition of BSCT has significant influence on the crystallization, melting, and glass transition behaviors of the PVDF matrix. The dielectric properties of the BSCT/PVDF composites are studied over a wide frequency range from 100 Hz to 1 GHz and a wide temperature range from −50 °C to 100 °C to explore the dependences of frequency and temperature. High dielectric constant (ɛ) up to 132 at 100 Hz and low dielectric loss (tan δ) down to 0.0045 at 1 GHz are achieved for the BSCT/PVDF composites. The obtained data of ε are also theoretically fit by different models, and the modified Lichtenecker equation and Jayasundere-Smith equation show the best match.
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